Resolve "MINERVANET - Error Report 169"

Closes #1126 (closed)

model-command/src/main/java/lcsb/mapviewer/commands/CopyCommand.java

@@ -277,11 +277,10 @@ public class CopyCommand extends NewModelCommand {
    *          original reaction
    * @return copy of the reaction
    */
-  private Reaction createCopy(Reaction reaction) {
+  Reaction createCopy(Reaction reaction) {
     Reaction copy = reaction.copy();
-    reaction.getNodes().clear();
-    for (AbstractNode node : copy.getNodes()) {
-      reaction.addNode(node);
+    for (AbstractNode node : reaction.getNodes()) {
+      node.setReaction(reaction);
     }
     copy.getNodes().clear();